function fn(person) {
    person.age = 19
    person = {
      name: '庆玲',
      age: 19
    }
    return person
  }
  const p1 = {
    name: '凤如',
    age: 18
  }
  const p2 = fn(p1)
  
  console.log(p1); // {name: '凤如',age: 19}
  console.log(p2); // {name: '庆玲',age: 19}
   